Transactions with Related Parties - Loan from USDG (Details) - CAD |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Related Party Transactions [Abstract] | ||
| Limited partner interest (as a percent) | 100.00% | 100.00% |
| USDG Loan [Member] | USDTC [Member] | Subsidiary of Common Parent [Member] | ||
| Related Party Transaction [Line Items] | ||
| Initial loan amount of unsecured loan facility | CAD 45,200,000.0 | |
| Capacity to increase unsecured loan facility | CAD 70,000,000.0 | |